So i have switched over from KStars running under Windows to run KStars under the Raspberry PI 4.

The Temperature based Focus is still not working, but now i can see following logs:

<pre>
, QVariant(qlonglong, 5196))))
[2020-09-30T12:36:20.491 CEST INFO ][ org.kde.kstars.ekos.focus] - "Idle."
[2020-09-30T12:36:20.494 CEST DEBG ][ org.kde.kstars.ekos.focus] - "Focuser temperature is not available"
[2020-09-30T12:36:20.494 CEST INFO ][ org.kde.kstars.ekos] - "DeepSkyDad AF3 focuser is online."
[2020-09-30T12:36:20.496 CEST DEBG ][ org.kde.kstars.ekos.focus] - "Focuser temperature is not available"
[2020-09-30T12:36:20.519 CEST DEBG ][ org.kde.kstars.ekos.capture] - Registering new Module ( "Capture" )
[2020-09-30T12:36:20.528 CEST DEBG ][ org.kde.kstars.ekos.capture] - Registering new Module ( "Focus" )
[2020-09-30T12:36:20.636 CEST DEBG ][ org.kde.kstars.ekos.focus] - "Focuser temperature is not available"
[2020-09-30T12:36:20.641 CEST DEBG ][ org.kde.kstars.ekos.focus] - "Focuser temperature is not available"
[2020-09-30T12:36:20.646 CEST DEBG ][ org.kde.kstars.ekos.focus] - "Focuser temperature is not available"
[2020-09-30T12:36:20.650 CEST DEBG ][ org.kde.kstars.ekos.focus] - "Focuser temperature is not available"
[2020-09-30T12:36:20.652 CEST DEBG ][ org.kde.kstars.ekos.focus] - "Focuser temperature is not available"
[2020-09-30T12:36:20.656 CEST DEBG ][ org.kde.kstars.ekos.focus] - "Focuser temperature is not available"
[2020-09-30T12:36:20.659 CEST DEBG ][ org.kde.kstars.ekos.focus] - "Focuser temperature is not available"
[2020-09-30T12:36:20.661 CEST DEBG ][ org.kde.kstars.ekos.focus] - "Focuser temperature is not available"
[2020-09-30T12:36:20.678 CEST DEBG ][ org.kde.kstars.ekos.focus] - "Focuser temperature is not available"
[2020-09-30T12:36:20.687 CEST DEBG ][ org.kde.kstars.ekos.focus] - "Focuser temperature is not available"
[2020-09-30T12:36:20.691 CEST DEBG ][ org.kde.kstars.ekos.focus] - "Focuser temperature is not available"
[2020-09-30T12:36:20.696 CEST DEBG ][ org.kde.kstars.ekos.focus] - "Focuser temperature is not available"
[2020-09-30T12:36:20.700 CEST DEBG ][ org.kde.kstars.ekos.focus] - "Setting current focuser temperature: 0.00"
</pre>

This is really strange, because the INDI Tab shows the Temp correctly and it is updated correctly, when taking the sensor into my hand: